Move style checks up to top-level fmt xtask.

I'm in the CI weeds anyway, better make something that fails
extraordinarily quickly.

.github/buildomat/jobs/lint.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+#:
+#: name = "lint"
+#: variety = "basic"
+#: target = "helios-2.0"
+#: rust_toolchain = "nightly-2024-05-12"
+#: access_repos = [
+#:  "oxidecomputer/illumos-rs",
+#: ]
+#:
+
+set -o errexit
+set -o pipefail
+set -o xtrace
+
+header "check style"
+ptime -m cargo xtask fmt --check

.github/buildomat/jobs/opte-api.sh

@@ -26,9 +26,6 @@ cd crates/opte-api
 header "check API_VERSION"
 ./check-api-version.sh
 
-header "check style"
-ptime -m cargo +nightly-2024-05-12 fmt -- --check
-
 header "analyze std"
 ptime -m cargo clippy --all-targets
 

.github/buildomat/jobs/opte-ioctl.sh

@@ -23,8 +23,5 @@ rustc --version
 
 cd lib/opte-ioctl
 
-header "check style"
-ptime -m cargo +nightly-2024-05-12 fmt -- --check
-
 header "analyze"
 ptime -m cargo clippy --all-targets

.github/buildomat/jobs/opte.sh

@@ -25,9 +25,6 @@ rustc --version
 
 cd lib/opte
 
-header "check style"
-ptime -m cargo +nightly-2024-05-12 fmt -- --check
-
 header "check docs"
 #
 # I believe this means any doc warnings in deps will cause this to

.github/buildomat/jobs/opteadm.sh

@@ -28,9 +28,6 @@ rustc --version
 
 pushd bin/opteadm
 
-header "check style"
-ptime -m cargo +nightly-2024-05-12 fmt -- --check
-
 header "analyze"
 ptime -m cargo clippy --all-targets
 

.github/buildomat/jobs/oxide-vpc.sh

@@ -25,9 +25,6 @@ rustc --version
 
 cd lib/oxide-vpc
 
-header "check style"
-ptime -m cargo +nightly-2024-05-12 fmt -- --check
-
 header "check docs"
 #
 # I believe this means any doc warnings in deps will cause this to

.github/buildomat/jobs/xde.sh

@@ -78,9 +78,6 @@ pushd xde
 
 cp xde.conf /work/xde.conf
 
-header "check style"
-ptime -m cargo +nightly-2024-05-12 fmt -p xde -p xde-link -- --check
-
 header "analyze"
 ptime -m cargo clippy -- \
     --allow clippy::uninlined-format-args --allow clippy::bad_bit_mask

xtask/src/main.rs

@@ -61,7 +61,11 @@ enum Xtask {
     },
 
     /// Format the repository with `rustfmt`.
-    Fmt,
+    Fmt {
+        /// Run rustfmt in check mode.
+        #[arg(long)]
+        check: bool,
+    },
 }
 
 #[derive(Debug, Args)]
@@ -140,17 +144,22 @@ fn main() -> anyhow::Result<()> {
 
             Ok(())
         }
-        Xtask::Fmt => {
+        Xtask::Fmt { check } => {
             let meta = cargo_meta();
 
             // This is explicitly `cargo` rather than CARGO as we might
             // be swapping toolchains to do this from the current cargo.
-            Command::new("cargo")
-                .arg(format!("+{}", get_current_nightly_toolchain()?))
+            let mut c = Command::new("cargo");
+            c.arg(format!("+{}", get_current_nightly_toolchain()?))
                 .args(["fmt", "--all"])
                 .env_remove("RUSTUP_TOOLCHAIN")
-                .current_dir(&meta.workspace_root)
-                .output_nocapture()?;
+                .current_dir(&meta.workspace_root);
+
+            if check {
+                c.arg("--check");
+            }
+
+            c.output_nocapture()?;
 
             Ok(())
         }